use define IGMP_V3_QUERY_MINLEN instead of IGMPV3_MINLEN

Author: Merlin Krümmel

src/igmp.c

@@ -276,7 +276,7 @@ static void buildIgmp(uint32_t src, uint32_t dst, int type, int code, uint32_t g
     ip                      = (struct ip *)send_buf;
     ip->ip_src.s_addr       = src;
     ip->ip_dst.s_addr       = dst;
-    ip_set_len(ip, IP_HEADER_RAOPT_LEN + IGMPV3_MINLEN + datalen);
+    ip_set_len(ip, IP_HEADER_RAOPT_LEN + IGMP_V3_QUERY_MINLEN + datalen);
 
     if (IN_MULTICAST(ntohl(dst))) {
         ip->ip_ttl = curttl;
@@ -330,7 +330,7 @@ void sendIgmp(uint32_t src, uint32_t dst, int type, int code, uint32_t group, in
 #endif
     sdst.sin_addr.s_addr = dst;
     if (sendto(MRouterFD, send_buf,
-               IP_HEADER_RAOPT_LEN + IGMPV3_MINLEN + datalen, 0,
+               IP_HEADER_RAOPT_LEN + IGMP_V3_QUERY_MINLEN + datalen, 0,
                (struct sockaddr *)&sdst, sizeof(sdst)) < 0) {
         if (errno == ENETDOWN)
             my_log(LOG_ERR, errno, "Sender VIF was down.");

src/os-linux.h

@@ -8,6 +8,7 @@
 #include <linux/mroute.h>
 
 #define IGMP_V3_MEMBERSHIP_REPORT 0x22
+#define IGMP_V3_QUERY_MINLEN IGMPV3_MINLEN
 
 #define INADDR_ALLIGMPV3_GROUP ((in_addr_t) 0xe0000016)